8(x²-2y²)-x(7x+y)+xy = (x²+5x+3)(x²+5x-2)-6

问题描述:

8(x²-2y²)-x(7x+y)+xy = (x²+5x+3)(x²+5x-2)-6

8(x²-2y²)-x(7x+y)+xy=8x²-16y²-7x²-xy+xy=x²-16y²=(x+4y)(x-4y)(x²+5x+3)(x²+5x-2)-6=(x²+5x)²-2(x²+5x)+3(x²+5x)-6-6=(x²+5x)...